defining and non defining relative clauses

DEFINING AND NONDEFINING RELATIVE CLAUSES Read the sentences Are they the same or different?  Ann’s sister who is a  Ann’s sister, who is a tennis champion visited her last weekend tennis champion, visited her last weekend  Has Ann got more  Has Ann got more than one sister?  YES than one sister?  NO  Defining relative clauses  They give ESSENTIAL INFORMATION  We DON’T USE COMMAS in them  Ann’s sister who is a tennis champion visited her last weekend  The table whose legs are broken is at the back of the classroom  Non-defining relative clauses  They give EXTRA INFORMATION  We USE COMMAS in them  Ann’s sister, who is a tennis champion, visited her last week  (We probably know that Ann has got only one sisiter)  Charles Dickens, whose novel Oliver Twist we read last term, was born two hundred years ago  (We already know that Ch.Dickens wrote Oliver Twist)  Non-defining relative clauses are also called non-essential relative clauses VERY  You cannot omit the pronoun in non-defining relative clauses IMPORTANT  That cannot replace who or which  ... Ch.Dickens wrote Oliver Twist)  Non -defining relative clauses are also called non- essential relative clauses VERY  You cannot omit the pronoun in non -defining relative clauses IMPORTANT  That cannot... her last weekend  The table whose legs are broken is at the back of the classroom  Non -defining relative clauses  They give EXTRA INFORMATION  We USE COMMAS in them  Ann’s sister, who is... weekend  Has Ann got more  Has Ann got more than one sister?  YES than one sister?  NO  Defining relative clauses  They give ESSENTIAL INFORMATION  We DON’T USE COMMAS in them  Ann’s sister